It is not from works that we are set free by the faith of Christ, but from the belief in works, that is from foolishly presuming to seek justification through works. Faith redeems our consciences, makes them upright, and preserves them, since by it we recognize the truth that justification does not depend on our works, although good works neither can nor ought to be absent, just as we cannot exist without food and drink and all the functions of this mortal body.

—Martin Luther
Concerning Christian Liberty, 393.